Indian Postal Code System Consists of Six digits. The first to digits represent the state, the second two digits represent the district and the Third two digits represents the Post Office.In this case the first two digits 51 represents the state Andhra Pradesh, the second two digits 51 represent the district Ananthapur, and finally 33 represents the Post Office Mirjapuram B.O. Thus the Zip Code of Mirjapuram B.O, Ananthapur, andhra pradesh is 515133